The project TomorrowS aims at designing current and future crop management ideotypes of wheat and cotton in the Mediterranean area, where a major impact of climate change on agriculture is expected. Cropping systems have to be resilient to the projected impact of climate change. In addition, due to uncertainty on irrigation water availability and pesticides costs, these cropping systems should also be resilient to a sub-optimal use of such inputs. Two years of Genotype x Environment x Crop Management (GEM) experiments will be conducted in Greece and in Tunisia on cotton and wheat. The factors studied in the GEM experiments will be the cultivar, amount of fertilization, amount of irrigation and salt content of irrigation water. These GEM experiments will provide sufficient data to calibrate, evaluate and enhance a deterministic crop model embedded in the Decision Support System for Agrotechnology Transfer (DSSAT) software application.